GNU bug report logs - #18592
FFI should have portable access to ‘errno’

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From: Mark H Weaver <mhw <at> netris.org>
To: ludo <at> gnu.org (Ludovic Courtès)
Cc: Chaos Eternal <chaoseternal <at> shlug.org>, 18592 <at> debbugs.gnu.org
Subject: bug#18592: FFI should have portable access to ‘errno’
Date: Sat, 24 Jan 2015 03:22:15 -0500

Mark H Weaver <mhw <at> netris.org> writes:

> ludo <at> gnu.org (Ludovic Courtès) writes:
>
>> Chaos Eternal <chaoseternal <at> shlug.org> skribis:
>>
>>> Proposal 2.
>>>
>>> let pointer->procedure check return_type, if it is a list:
>>> (func_return_type, 'errno)
>>> then return multiple values, as errno be second value.
>>
>> That’s my favorite because it’s both pragmatic and extensible (we can
>> also add support for h_errno, etc.)
>
> We can't do this, because although it's not documented in our manual, a
> list passed as a foreign type already has a meaning: it means a struct.
> See 'parse_ffi_type' in foreign.c.

Also see 'fill_ffi_type' in the same file.

    Mark

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